There are couple threads on this over in the tire and wheel section. You'll be cutting it close with anything wider than stock. You can go slightly higher, but not much-that's my impression anyhow. Let us know what you decide.

Even if you're not driving in entry/exit, you might want to think about accidental key fob hits, which makes the truck enter the entry/exit setting...you don't want a tire ripping off or tearing the fender plastic...just a thought.

Thanks for the info, I believe the accidental fob hit's wont matter when I'm driving over a certain speed, not positive yet as I don't have my truck but thought I read 15mph and it goes in normal. I keep seeing pic of the rams in exit mode and it look like it has a ton of clearance, then again pics are deceiving.